Question

A child with 47 chromosomes due to three
copies of chromosome 21 is characterized by
A
Delay in blood clotting
B
Unable to detect certain colours
C
Big and wrinkled tongue
D Lack of pigmentation in skin, hair
and iris​

Answer 1

Down syndrome

Down syndromeThe presence of full or partial extra three copies of chromosome 21 causes Down syndrome. It is called as trisomy 21 and is represented as 45 +XY or 45+XX.